teken_scs.h revision 197471 
1/*-
2 * Copyright (c) 2009 Ed Schouten <ed@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD: head/sys/teken/teken_scs.h 197471 2009-09-24 20:34:44Z ed $
27 */
28
29static void
30teken_scs_set(teken_t *t, unsigned int g, teken_scs_t *ts)
31{
32
33	t->t_scs[g] = ts;
34}
35
36static void
37teken_scs_switch(teken_t *t, unsigned int g)
38{
39
40	t->t_curscs = g;
41}
42
43static void
44teken_scs_restore(teken_t *t)
45{
46
47	t->t_scs[t->t_curscs] = t->t_saved_curscs;
48}
49
50static void
51teken_scs_save(teken_t *t)
52{
53
54	t->t_saved_curscs = t->t_scs[t->t_curscs];
55}
56
57static teken_char_t
58teken_scs_process(teken_t *t, teken_char_t c)
59{
60
61	return (t->t_scs[t->t_curscs](t, c));
62}
63
64/* Unicode points for VT100 box drawing. */
65static const uint16_t teken_boxdrawing_unicode[31] = {
66    0x25c6, 0x2592, 0x2409, 0x240c, 0x240d, 0x240a, 0x00b0, 0x00b1,
67    0x2424, 0x240b, 0x2518, 0x2510, 0x250c, 0x2514, 0x253c, 0x23ba,
68    0x23bb, 0x2500, 0x23bc, 0x23bd, 0x251c, 0x2524, 0x2534, 0x252c,
69    0x2502, 0x2264, 0x2265, 0x03c0, 0x2260, 0x00a3, 0x00b7
70};
71
72/* CP437 points for VT100 box drawing. */
73static const uint8_t teken_boxdrawing_8bit[31] = {
74    0x04, 0xb1, 0x48, 0x46, 0x43, 0x4c, 0xf8, 0xf1,
75    0x4e, 0x56, 0xd9, 0xbf, 0xda, 0xc0, 0xc5, 0xc4,
76    0xc4, 0xc4, 0xc4, 0xc4, 0xc3, 0xb4, 0xc1, 0xc2,
77    0xb3, 0xf3, 0xf2, 0xe3, 0xd8, 0x9c, 0xfa,
78};
79
80static teken_char_t
81teken_scs_special_graphics(teken_t *t, teken_char_t c)
82{
83
84	/* Box drawing. */
85	if (c >= '`' && c <= '~')
86		return (t->t_stateflags & TS_8BIT ?
87		    teken_boxdrawing_8bit[c - '`'] :
88		    teken_boxdrawing_unicode[c - '`']);
89	return (c);
90}
91
92static teken_char_t
93teken_scs_uk_national(teken_t *t, teken_char_t c)
94{
95
96	/* Pound sign. */
97	if (c == '#')
98		return (t->t_stateflags & TS_8BIT ? 0x9c : 0xa3);
99	return (c);
100}
101
102static teken_char_t
103teken_scs_us_ascii(teken_t *t __unused, teken_char_t c)
104{
105
106	/* No processing. */
107	return (c);
108}
109